scsi: hisi_sas: Expose HW queues for v2 hw

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As a performance enhancement, make the completion queue interrupts managed.

In addition, in commit bf0beec060 ("blk-mq: drain I/O when all CPUs in a
hctx are offline"), CPU hotplug for MQ devices using managed interrupts is
made safe. So expose HW queues to blk-mq to take advantage of this.

Flag Scsi_host.host_tagset is also set to ensure that the HBA is not sent
more commands than it can handle. However the driver still does not use
request tag for IPTT as there are many HW bugs means that special rules
apply for IPTT allocation.

Link: https://lore.kernel.org/r/1606905417-183214-6-git-send-email-john.garry@huawei.com
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

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John Garry 2020-12-02 18:36:57 +08:00 • committed by Martin K. Petersen

parent 81e7eb5bf0

commit 74a2921948

3 changed files with 68 additions and 13 deletions

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4

drivers/scsi/hisi_sas/hisi_sas.h

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11

drivers/scsi/hisi_sas/hisi_sas_main.c

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66

drivers/scsi/hisi_sas/hisi_sas_v2_hw.c

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